Results obtained from high temperature creep tests of ferritic steel CrMoV, P91 and P92 cross-weld specimens are compared. Data are presented normalized with the results of the corresponding parent metals in order to compare the materials tested at different temperatures and stresses, and to identify characteristic cross-weld material trends. All cross-weld failures occurred in the heat-affected zone (HAZ) adjacent to the parent metal, known as type IV, at earlier test durations than for the parent material specimens. The relative performance of the cross-welds was found to decrease with decreasing stress. The CrMoV cross-weld specimens showed by far the lowest weld strength reduction factors and greatest notch strengthening, determined by testing uniaxially loaded bars with semicircular circumferential notches located in the heat-affected zone. The P91 and P92 cross-weld specimens were found to have similar (high) weld strength reduction factors and showed little or no notch strengthening. The failure time of a P92 cross-weld specimen relative to the P92 parent material could be estimated using data from P91 cross-weld and relative parent material tests.

References

References
1.
Hyde
,
T. H.
,
Sun
,
W.
, and
Williams
,
J. A.
,
1999
, “
Creep Behaviour of Parent, Weld and HAZ Materials of New, Service-Aged and Repaired 1/2Cr1/2Mo1/4V: 2 1/4Cr1Mo Pipe Welds at 640 °C
,”
Mater. High Temp.
,
16
(
3
), pp.
117
129
.10.3184/096034099783641173
2.
Francis
,
J. A.
,
Mazur
,
W.
, and
Bhadeshia
,
H. K. D. H.
,
2006
, “
Review: Type IV Cracking in Ferritic Power Plant Steels
,”
Mater. Sci. Technol.
,
22
(
12
), pp.
1387
1395
.10.1179/174328406X148778
3.
Hyde
,
T. H.
,
Sun
,
W.
, and
Williams
,
J. A.
,
2003
, “
Creep Analysis of Pressurized Circumferential Pipe Weldments—A Review
,”
J. Strain Anal. Eng. Des.
,
38
(
1
), pp.
1
27
.10.1243/030932403762671854
4.
Hyde
,
T. H.
,
Becker
,
A. A.
,
Sun
,
W.
,
Yaghi
,
A.
,
Williams
,
J. A.
, and
Concari
,
S.
,
2006
, “
Determination of Creep Properties for P91 Weldment Materials at 625 °C
,”
5th International Conference on Mechanics and Materials in Design
,
Porto, Portugal
, A0402.0405.
5.
Tanner
,
D. W. J.
,
Saber
,
M.
,
Sun
,
W.
, and
Hyde
,
T. H.
,
2012
, “
Creep Behaviour of P92 and P92 Welds at 675 °C
,”
ASME 2012 Pressure Vessels and Piping Conference, ASME
,
New York
, PVP2012-78555.
6.
Richardot
,
D.
,
Vaillant
,
J. C.
,
Arbab
,
A.
, and
Bendick
,
W.
,
2000
,
The T92/P92 Book
,
Vallourec & Mannesmann Tubes
, Düsseldorf, Germany.
7.
Gooch
,
D. J.
,
1990
, “
Creep Ductility Considerations in Design and Assessment
,”
Conference on Rupture Ductility of Creep Resistant Steels, The Institute of Metals
,
London
, pp.
302
312
.
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